LT1117IST-3.3 Low Dropout Linear Voltage Regulator with 3.3V Output and 800mA Current in SOT-223-3 Package

The LT1117IST - 3.3 is a low - dropout positive voltage regulator, and its typical application circuits mainly include the following types:

• Circuit Composition: The input voltage is 5V DC, and the LT1117IST - 3.3 chip is used. An input filter capacitor (such as 10μF) is connected to the Vin pin of LT1117IST - 3.3, and an output filter capacitor (such as 10μF) is connected to the Vout pin. The GND pin is grounded.
• Application Scenarios: It is widely used in power - supplying microcontroller systems, such as STM32 microcontrollers, and sensor circuits, providing a stable 3.3V power supply.

• Circuit Composition: First, the 24V industrial power supply is stepped down to 5V through a DC - DC module. Then, the 5V voltage is input to the LT1117IST - 3.3. Similar to the 5V to 3.3V conversion circuit, an input filter capacitor is connected to the Vin pin of LT1117IST - 3.3, and an output filter capacitor is connected to the Vout pin, with the GND pin grounded.
• Application Scenarios: It is used for power - supplying PLC control circuits and communication modules in industrial control systems, ensuring the stable operation of these circuits.

• Circuit Composition: In the interface processing board, the input port of the LT1117IST - 3.3 linear voltage regulator is connected to the 5V power - supply port, and the output port is used as the 3.3V power - supply port. This 3.3V power supply is then connected to the power ports of components such as the single - chip microcomputer circuit (such as C8051F020 single - chip microcomputer), crystal oscillator circuit, power - monitoring circuit (such as TPS3307 - 18D power - monitor), dual - port RAM circuit (such as IDT70V24L20PFI dual - port RAM), and serial - communication circuit (such as MAX3488EESA transceiver).
• Application Scenarios: It is applicable to data - transmission occasions, effectively isolating the interference of external power - supply spikes on the operation of the interface processing board and having the advantage of strong anti - interference ability.